Electrical Engineering Questions and Answers
In this Post, we have given Electrical Engineering Questions and Answers.
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- In a control system, an error detector
(a) Detects the error and signal out an alarm
(b) Detects the errors of the system
(c) Produces an error signal as actual difference. of value & desired value of output
(d) Any of the above 2. Which instruction of 8051 microcontroller is used for reading data from code memory?
(a) MOV
(2) NOVX
(b) MOVC
- Which of the following is used for turning ON DIAC
(a) High voltage on anode
(b) Break over voltage
(c) Gate voltage
(d) Gate current
4. A register capable of incrementing and/or decrementing it’s contentsโฆ
(a) Counter (c) Multiplexer
(b) Decoder
(d) Demultiplexer
- A Schmitt trigger is a digital circuit that produces?
(a) triangular output for sinusoidal input
(b) sinusoidal output for any type of input
(c) trapezoidal output for any type of input
(d) rectangular output for any type of input
6. Percentage tapping required of an auto -transformer for a cage motor to start the motor against 1/4 of full load will be?
(a) 70%
(c) 71.5%
(b) 71% (d) 72.2%
- What percentage of the rated output for DC machine and synchronous machine is taken as stray load losses respectively?
- (a) 1% and 0.5%
(c) 3% and 0.1%
(b) 0.5% and 1%
(d) 0.1% and 5%
8. Under the influence of fluorescent lamps sometimes the wheels of rotating machinery appear to be stationary. This is due to theโฆโฆ..
(a) Low power factor
(b) Stroboscopic effect
(c) Luminescence effect
(d) Fluctuations
9. Commercial Schering bridge can be used for the measurement of capacitances from (a) 10pF to 0.1nF
(c) 50nF to 10mF
(d) 25mF to 5F
10. Pumped hydroelectric is an example of
(a) Gravitational potential storage
(b) Latent heat storage
(c) Thermal storage
(d) Hydroelectric power generation. 11. In direct arc furnace which of the following has
highest value?
(a) Current
(b) Voltage
(d) All of the above
(c) Power factor
- Counterpoise is used for:
(a) Transformer earthing (b) Reducing transmission tower footing resistance
(e) Generator earthing (d) Motor earthing
13. As per Indian Electricity rule in overhead systems, the recommended span in case of wooden pole:
(a) 100-300 meters
(b) 40 – 50 meters
(c) 50-80 meters
(d) 80-100 meters
A shunt reactor of 100 MVAR is operated at 98% of it’s rated voltage & at 96 % of it’s rated
frequency. The reactive power absorbed by the reactor is:
(a) 98 MVAR
(b) 10.402 MVAR
(d) 10004 MVAR
(c) 96.04 MVAR
In the susceptibility will decrease with increase in temperature and they have relatively small
susceptibility at all temperatures:
(a) Anti ferromagnetic materials (b) Ferrimagnetic materials
(c) Superparamagnetic materials (d) Ferromagnetic materials
16. An overexcited synchronous motor draws:
(b) Leading current
(a) Lagging current
(c) No effect on current
(d) None of the above
- The electrical circuit, used to get smooth DC output from a rectifier circuit is called. (c) Amplifier
(a) Oscillator
(b) Filter (d) Logic gate
(b) 100pF to 1uF
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